[WIP] do something :-)

Source/platform/heap/HeapTest.cpp

Index: Source/platform/heap/HeapTest.cpp
diff --git a/Source/platform/heap/HeapTest.cpp b/Source/platform/heap/HeapTest.cpp
index 3772165f28ad414586d10687e6b6f24d8b29f7c7..57d9fd5a4d367fc0f2f7d166fbf446029fde8076 100644
--- a/Source/platform/heap/HeapTest.cpp
+++ b/Source/platform/heap/HeapTest.cpp
@@ -43,6 +43,7 @@
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/HashTraits.h"
 #include "wtf/LinkedHashSet.h"
+#include "wtf/SizeAssertions.h"
 
 #include <gtest/gtest.h>
 
@@ -88,11 +89,7 @@ private:
 static_assert(WTF::NeedsTracing<IntWrapper>::value, "NeedsTracing macro failed to recognize trace method.");
 
 #if !ENABLE(GC_PROFILING)
-struct SameSizeAsPersistent {
-    void* m_pointer[4];
-};
-
-static_assert(sizeof(Persistent<IntWrapper>) <= sizeof(SameSizeAsPersistent), "Persistent handle should stay small");
+ASSERT_SIZE(Persistent<IntWrapper>, 16, 16);
 #endif
 
 class ThreadMarker {